Holy Cow!

Breaking the Back of Buffett

What's amazing is how clueless many self-proclaimed experts are.
Berkshire's "derivatives" have nothing in common with those that are bringing down so many companies. They are simply long-term bets on the US market which have no impact on Berkshire for a minimum of nine years. If you think the market will be lower nine years from now, then yes, they would have an impact.
And I assure, they are not "haunting" Warren Buffett. You have either never read anything the man has written, or you are intentionally ignoring it. He has said on many occasions that he doesn't know what the market will do next week, next month, or next year. In this particular case, he is only betting that it will be higher in nine years.